The very thought of paying top wack for something that you are only going to wipe your @rse with it mystifies me.
As a bachelor, a 4 pack of toilet paper last me weeks, although I am aware that the situation is not the same where the female of the species is involved !
Soap and water is the best way that I know of, which is why I got a bidet fitted about 10 years ago.
For the record, that nice aloe-vera stuff that Lidl sells is an ideal mixture of cheapness and useability.
https://www.lidl.co.uk/en/Products.htm?articleId=970&ar=5